Ignition mechanism of nickel-coated aluminum particles

Andrzejak, Timothy A.; Shafirovich, Evgeny; Varma, Arvind

doi:10.1016/j.combustflame.2007.03.004

Cited by 79 publications

(49 citation statements)

References 22 publications

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“…The thermodynamic modification is therefore necessary to improve its usability and reliability. Several reactive Al-Ni systems have been produced by methods like combustion synthesis [8], mixing and pressing of powders [9,10], welding [11,12], forging [13], rolling [14,15], vacuum deposition [11,15], cladding [16], and high energy ball milling [17][18][19]. It is well-known fact that the reactivity of these composites depends strongly on their corresponding microstructures.…”

Section: Introductionmentioning

confidence: 99%

Exothermic Reaction Kinetics in High Energy Density Al-Ni with Nanoscale Multilayers Synthesized by Cryomilling

Han

et al. 2018

Metals

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Abstract:The Al-Ni system is known as a high energy density materials (HEDM) because of its highly exothermic nature during intermetallic compound (IMC) formation. In this study, elemental Al and Ni powder were milled to explore the effect of cryomilling atmosphere on the microstructure and exothermic behavior. Scanning electron microscope (SEM) observations show continuous structural refinement up to 8 h of cryomilling. No IMC phase was detected in the X-ray diffraction (XRD) spectrum. Differential thermal analyzer (DTA) results show two exothermic peaks for 8 h cryomilled powder as compared to that of powder milled for 1 h. The ignition temperature of prepared powder mixture also decreased due to gradual structural refinement. The activation energy was also calculated and correlated with the DTA and SEM results. The cryomilled Al-Ni powder is composed of fine Al-Ni metastable junctions which improve the reactivity at a lower exothermic reaction temperature.

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Section: Introductionmentioning

confidence: 99%

Exothermic Reaction Kinetics in High Energy Density Al-Ni with Nanoscale Multilayers Synthesized by Cryomilling

Han

et al. 2018

Metals

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“…Interestingly, the agglomeration of dust particles is not only observed in the iron dust particles, but also in aluminum particles during dust combustion leading to incomplete combustion of aluminum and slag formation inside the combustion chamber. It is demonstrated that [42] coating aluminum with nickel reduced particle agglomeration during dust combustion. Fig.…”

Section: Resultsmentioning

confidence: 98%

Mathematical modeling of velocity and number density profiles of particles across the flame propagation through a micro-iron dust cloud

Bidabadi

Haghiri

Rahbari

2010

Journal of Hazardous Materials

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“…In an attempt to improve the performance of commonly used micron-sized Al particles, research efforts have been made to devise novel methods to reduce their ignition temperature and agglomeration [128]. It is found that a coating of nickel (Ni) over Al particle reduces its ignition temperature by ~ 800 K [128].…”

Section: Ii27 Multi-scale Modeling Of Nano-aluminum Particle Ignitimentioning

confidence: 99%

“…It is found that a coating of nickel (Ni) over Al particle reduces its ignition temperature by ~ 800 K [128]. However, the fundamental mechanisms behind such an observation are not well understood and theories postulated also need clarification from atomistic calculations over a broad range of particle sizes.…”

Section: Ii27 Multi-scale Modeling Of Nano-aluminum Particle Ignitimentioning

confidence: 99%

Nano Engineered Energetic Materials (NEEM)

Dlott¹,

Eden²,

Girolami³

et al. 2011

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. The ARO Nano Engineered Energetic Materials (NEEM) MURI program has been exploring new methodologies for developing energetic material formulations with control of all constituents over a wide range of length scales from 1 nm to 1 mm and larger and employing the latest techniques in molecular self-assembly and supramolecular chemistry for synthesizing and assembling NEEMs. The synthetic efforts have been guided by theoretical calculations and dynamic performance testing methodologies that also operate on all length scales. This final report ABSTRACTThe ARO Nano Engineered Energetic Materials (NEEM) MURI program has been exploring new methodologies for developing energetic material formulations with control of all constituents over a wide range of length scales from 1 nm to 1 mm and larger and employing the latest techniques in molecular self-assembly and supramolecular chemistry for synthesizing and assembling NEEMs. The synthetic efforts have been guided by theoretical calculations and dynamic performance testing methodologies that also operate on all length scales. This final report provides a summary of the accomplishments. In particular, new methods to generate metal nanoclusters were developed that are stabilized against environmental degradation while preserving their high energy content. Rapid expansion supercritical solution processes were developed and applied to synthesize nanosized particulate oxidizers and energetic oxidizer shell/fuel core composites. Surface science and experimental chemistry methods were applied to study the structures and energy releasing reaction pathways of NEEMs. Unique diagnostic capabilities were developed and applied to study the fundamental mechanisms that underlie NEEM dynamic performance. Combustion mechanisms of various NEEMs, including nanothermites and nanoparticulate fuel/liquid oxidizer systems, were experimentally analyzed. The reactive and thermal characteristics of NEEMs were studied using large (billion atoms) multiscale simulations that couple quantum-mechanical calculations to molecular dynamics calculations. In particular, the stability, structure and energetics of metallic nanoparticles with a special focus on the relationships between particle size, shape and excess surface free energy were studied. A unified theory of ignition and combustion of aluminum particles for a wide range of sizes, from nano to meso scales was established. . 12, 777-787 (2010 (b) Papers published in non-peer-reviewed journals or in conference proceedings (N/A for none)18.00 Number of Papers published in peer-reviewed journals:Number of Papers published in non peer-reviewed journals:1. USC group, "Multibillion-atom simulations of nano-mechano-chemistry on petaflops computers," First

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Ignition mechanism of nickel-coated aluminum particles

Cited by 79 publications

References 22 publications

Exothermic Reaction Kinetics in High Energy Density Al-Ni with Nanoscale Multilayers Synthesized by Cryomilling

Exothermic Reaction Kinetics in High Energy Density Al-Ni with Nanoscale Multilayers Synthesized by Cryomilling

Mathematical modeling of velocity and number density profiles of particles across the flame propagation through a micro-iron dust cloud

Nano Engineered Energetic Materials (NEEM)

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